CN114050710A - Switching power supply circuit - Google Patents
Switching power supply circuit Download PDFInfo
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- CN114050710A CN114050710A CN202111173058.2A CN202111173058A CN114050710A CN 114050710 A CN114050710 A CN 114050710A CN 202111173058 A CN202111173058 A CN 202111173058A CN 114050710 A CN114050710 A CN 114050710A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention relates to the technical field of electronic circuits, and discloses a switching power supply circuit, which comprises: the signal source is connected with a first end of the inductor, a second end of the inductor is connected with a first input end of the switching power supply module, a first end of the capacitor is connected with a second input end of the switching power supply module, a second end of the capacitor is grounded, wherein, the switch power supply module comprises a current path module, a voltage division circuit module, a first comparator, a control logic module, a drive control module and a peak current detection module, the voltage division circuit module is connected with the first comparator and the capacitor, the first comparator is connected with the control logic module, the control logic module is connected with the driving control module and the peak current detection module, the driving control module is connected with the current path module, the inductor is connected with the current path module, the current path module is connected with the peak current detection module, and the peak current detection module is connected with the capacitor, so that power supply overvoltage is avoided, and a load circuit is protected from being damaged.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a switching power supply circuit.
Background
The switching power supply is widely applied with the advantage of high efficiency, in daily life, the condition that the load end is over-voltage due to over-voltage of power supply and further a load circuit is damaged frequently occurs, and the switching power supply generally needs various protection functions for preventing the damage caused by abnormal work in application, wherein the over-voltage protection function is used for preventing a chip or a device from being broken down to cause damage due to overhigh output voltage.
At present, the voltage detection scheme of overvoltage protection mainly comprises inductance demagnetization time detection, volt-second balance or auxiliary winding detection, wherein the inductance demagnetization time detection and the volt-second balance scheme have higher requirements on inductance current and switching frequency, the phenomenon of false detection easily occurs when the matching is not appropriate, the auxiliary winding detection mode needs to use an additional transformer winding for detection, the cost is higher, and the structure is more complex.
Disclosure of Invention
The embodiment of the invention provides a switching power supply circuit which can avoid power supply overvoltage and protect a load circuit from being damaged.
In order to solve the above technical problem, an embodiment of the present application provides a switching power supply circuit, including:
the signal source is connected with a first end of the inductor, a second end of the inductor is connected with a first input end of the switching power supply module, a first end of the capacitor is connected with a second input end of the switching power supply module, and a second end of the capacitor is grounded, wherein the switching power supply module comprises a current path module, a voltage division circuit module, a first comparator, a control logic module, a driving control module and a peak current detection module, wherein,
the output end of the voltage division circuit module is connected with the first input end of the first comparator, the input end of the voltage division circuit module is connected with the first end of the capacitor, the output end of the first comparator is connected with the first input end of the control logic module,
the first output end of the control logic module is connected with the second input end of the drive control module, the second output end of the control logic module is connected with the fourth input end of the peak current detection module, the third output end of the control logic module is connected with the fifth input end of the peak current detection module, the output end of the peak current detection module is connected with the second input end of the control logic module,
the first output end of the driving control module is connected with the first input end of the current path module, the second end of the inductor is connected with the second input end of the current path module, the second output end of the driving control module is connected with the third input end of the current path module, the third output end of the driving control module is connected with the fourth input end of the current path module, wherein the second input end of the current path module is used as the first input end of the switching power supply module,
the first output end of the current path module is connected with the third input end of the peak current detection module, the second output end of the current path module is connected with the first input end of the peak current module, the third output end of the current path module is connected with the second input end of the peak current module,
and a third input end of the peak current detection module is connected with the first end of the capacitor, wherein the third input end of the peak current detection module is used as a second input end of the switching power supply module.
The switching power supply circuit provided by the embodiment of the invention is a switching power supply circuit, comprising: the signal source is connected with a first end of the inductor, a second end of the inductor is connected with a first input end of the switching power supply module, a first end of the capacitor is connected with a second input end of the switching power supply module, and a second end of the capacitor is grounded, wherein the switching power supply module comprises a current path module, a voltage division circuit module, a first comparator, a control logic module, a driving control module and a peak current detection module, an output end of the voltage division circuit module is connected with a first input end of the first comparator, a first end of the capacitor is arranged at an input end of the voltage division circuit module, an output end of the first comparator is connected with a first input end of the control logic module, a first output end of the control logic module is connected with a second input end of the driving control module, a second output end of the control logic module is connected with a fourth input end of the peak current detection module, the third output end of the control logic module is connected with the fifth input end of the peak current detection module, the output end of the peak current detection module is connected with the second input end of the control logic module, the first output end of the drive control module is connected with the first input end of the current path module, the second end of the inductor is connected with the second input end of the current path module, the second output end of the drive control module is connected with the third input end of the current path module, and the third output end of the drive control module is connected with the fourth input end of the current path module, wherein the second input end of the current path module is used as the first input end of the switching power supply module, the first output end of the current path module is connected with the third input end of the peak current detection module, the second output end of the current path module is connected with the first input end of the peak current module, and the third output end of the current path module is connected with the second input end of the peak current module, the third input end of the peak current detection module is connected with the first end of the capacitor, and the third input end of the peak current detection module is used as the second input end of the switching power supply module, so that power supply overvoltage is avoided, and a load circuit is protected from being damaged.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a circuit configuration schematic diagram of an embodiment of a switching power supply circuit of the present application;
fig. 2 is a schematic circuit diagram of a current path module of an embodiment of the switching power supply circuit of the present application;
fig. 3 is a schematic structural diagram of a voltage divider circuit module according to an embodiment of the switching power supply circuit of the present application;
FIG. 4 is a schematic diagram of a peak current detection module according to an embodiment of a switching power supply circuit of the present application;
FIG. 5 is a waveform schematic diagram of a control logic block in a self-powered mode according to one embodiment of a switching power supply circuit of the present application;
FIG. 6 is a waveform schematic diagram of a control logic block in a no self-powered mode according to one embodiment of a switching power supply circuit of the present application;
fig. 7 is a schematic structural diagram of a drive control module according to an embodiment of the switching power supply circuit of the present application.
Detailed Description
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different objects and not for describing a particular order.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 shows a switching power supply circuit according to an embodiment of the present invention, including: the signal source 02 is connected with a first end of the inductor 03, a second end of the inductor 03 is connected with a first input end of the switching power supply module 01, a first end of the capacitor 04 is connected with a second input end of the switching power supply module 01, a second end of the capacitor is grounded, the switching power supply module 01 comprises a current path module 40, a voltage division circuit module 70, a first comparator 10, a control logic module 20, a driving control module 30 and a peak current detection module 50, wherein,
the output terminal of the voltage dividing circuit module 70 is connected to the first input terminal of the first comparator 10, the input terminal of the voltage dividing circuit module 70 is connected to the first terminal of the capacitor 04, the output terminal of the first comparator 10 is connected to the first input terminal kr1 of the control logic module 20,
the first output kc1 of the control logic module 20 is connected to the second input qr2 of the drive control module 30, the second output kc2 of the control logic module 20 is connected to the fourth input fr4 of the peak current detection module 50, the third output kc3 of the control logic module 20 is connected to the fifth input fr5 of the peak current detection module 50, the output fc of the peak current detection module 50 is connected to the second input kr2 of the control logic module 20,
the first output qc1 of the driving control module 30 is connected to the first input dr1 of the current path module 40, the second end of the inductor 01 is connected to the second input dr2 of the current path module 40, the second output qc2 of the driving control module 30 is connected to the third input dr3 of the current path module 40, the third output qc3 of the driving control module 30 is connected to the fourth input dr4 of the current path module 40, wherein the second input dr2 of the current path module 40 is used as the first input of the switching power module 01,
the first output dc1 of the current path module 40 is connected to the third input fr3 of the peak current detection module 50, the second output dc2 of the current path module 40 is connected to the first input fr1 of the peak current module 50, the third output dc3 of the current path module 40 is connected to the second input fr2 of the peak current module 50,
the third input terminal fr3 of the peak current detection module 50 is connected to the first terminal of the capacitor 04, wherein a connection point of the third input terminal fr3 of the peak current detection module 50 and the input terminal of the voltage division circuit module 70 serves as a second input terminal of the switching power supply module 01, and the output terminal fc of the peak current detection module 50 is connected to the second input terminal kr2 of the control logic module 20.
Specifically, the signal source 02 may be a high voltage rectifier circuit, which provides a high voltage dc signal, and the first comparator 10 is configured to determine whether the voltage of the power voltage VDD node is higher than or lower than a reference voltage at the second input terminal of the first comparator 10, so as to determine to output a high level or a low level, and further control the control logic module 20.
It should be noted that, as shown in fig. 1, a connection point of the first terminal of the capacitor 04, the input terminal of the voltage dividing circuit module 30 and the third input terminal fr3 of the peak current detection module 50 is used as the power supply voltage VDD node, and the control logic module may be implemented by a logic circuit with 2-port input and multi-port output, where the logic circuit is a circuit that performs logic operation and operation of digital signals based on binary system principle by transferring and processing discrete signals.
In this embodiment, the voltage divider circuit module divides the voltage of the VDD node to output a divided voltage signal to the first input terminal of the first comparator and the reference voltage of the second input terminal of the first comparator for comparison, so as to output a high level signal or a low level signal to the control logic module, so that the control logic module outputs a signal, so that the driving control module outputs a tri-state signal and a bi-state signal to the current path module to output a current signal to the peak current module, and at the same time, the control logic module outputs a switch control signal to the peak current module, so that the peak current module outputs a signal to the control logic module, and further adjusts the operating mode of the control logic module through the output signal, thereby controlling the charging or stopping charging of the VDD node, avoiding power supply overvoltage, and protecting the load circuit from being damaged.
In one embodiment, as shown in fig. 2, the current path module 40 includes a transistor 41, a first fet 42, a second fet 43, a third fet 44, and a fourth fet 45, wherein,
the base of the transistor 41 is the first input terminal dr1 of the current path module 40, the collector of the transistor 41 is the second input terminal dr2 of the current path module 40, the emitter of the transistor 41 is connected to the drain of the first fet 42, the drain of the second fet 43 and the drain of the third fet 44,
the gate of the first fet 42 is used as the third input dr3 of the current path block 40, the gate of the second fet 43 is connected to the gate of the first fet 42, the source of the first fet 42 is the first output dc1 of the current path block 40, the source of the second fet 43 is used as the second output dc2 of the current path block 40,
the gate of the third fet 44 serves as the fourth input dr4 of the current path block 40, the drain of the fourth fet 45 serves as the third output dc3 of the current path block 40,
the grid of the first field effect transistor 42 is connected with the grid of the second field effect transistor 43, the grid of the third field effect transistor 44 is connected with the grid of the fourth field effect transistor 45, and the source of the third field effect transistor 44 and the source of the fourth field effect transistor 45 are grounded.
Specifically, when the transistor 41 and the third fet 44 are turned on simultaneously, the first fet 42 and the second fet 43 are turned off simultaneously, the collector of the transistor 41 is lowered to a low level of 0V, and the current of the inductor 03 can be driven to rise linearly. When the transistor 41 and the first fet 42 are turned on simultaneously, the third fet 44 and the fourth fet 45 are turned off simultaneously, and the collector of the transistor 41 is raised to the voltage of the VDD node, which is, in particular, much lower than the voltage provided by the signal source 02, the current of the inductor 03 can also be driven to rise linearly, wherein the current flowing through the fourth fet 45 is in a fixed proportion to the current flowing through the third fet 44, and the current flowing through the second fet 43 is in a fixed proportion to the current flowing through the first fet 42.
Specifically, assuming that the initial state of the power supply voltage VDD node is 0V, when the high-voltage dc voltage signal provided by the signal source rises from 0V to a first preset voltage value, the high-voltage dc signal passes through the inductor 03, the starting resistor 60 supplies current to the base of the transistor 41, and the power supply voltage VDD node is charged through the first fet 42 after being amplified by the transistor 41. Before the power supply voltage VDD reaches the second predetermined voltage level, the first fet 42 is turned on. When the voltage of the power voltage VDD reaches the second preset value, the switching power supply circuit starts to operate, at this time, the output voltage of the power voltage VDD node after voltage division through the voltage division circuit module is input to the first input terminal of the first comparator 10 and is smaller than the reference voltage of the second input terminal of the first comparator 10, at this time, the output terminal of the first comparator 10 outputs a low level and the control logic module 20 enters the self-powered driving mode, the control logic module 20 outputs driving control signals S1 to S6 at the first output terminal kc1 of the control logic module 20 according to the logic of the self-powered driving mode, and outputs switching control signals at the second output terminal kc2 of the control logic module 20 and the third output terminal kc3 of the control logic module 20 to control the peak current value detection module 50.
Referring to the waveform diagram of fig. 5, wherein Ipk1 is a first current preset value, Ipk2 is a second current preset value, Ip _ sen is a current signal output by the source of the second fet 43, In _ sen is a current signal output by the drain of the fourth fet 45, B is an output signal of the first output qc1 of the driving control module 30, E is an output signal of the emitter of the transistor 41, N1_ gate is an output signal of the third output qc3 of the driving control module 30, and P1_ gate is an output signal of the second output qc2 of the driving control module 30, the self-powered driving mode control logic is explained as follows:
the driving current is output to the base of the triode 41 by controlling the first output end qc1 of the driving control module 30, and the second output end qc2 of the driving control module 30 and the third output end qc3 of the driving control module 30 output high level, at this time, the triode 41 and the third field effect transistor 44 are synchronously turned on, the first field effect transistor 42 and the second field effect transistor 43 are turned off, and the current flowing through the inductor 03, the triode 41 and the third field effect transistor 44 linearly rises. The fourth fet 45 and the third fet 44 are in a fixed ratio, so that the current flowing through the third fet 44 and the current flowing through the fourth fet 45 rise in a fixed ratio, and the current flowing through the fourth fet 45 is supplied to the peak current detection module 50. When the peak current detection module 50 detects that the output current of the drain of the fourth field effect transistor 45 reaches the first current preset value, the driving control module 30 drives the gate of the third field effect transistor 44 and the gate of the fourth field effect transistor 45 to be at a low level to turn off the third field effect transistor 44 and the fourth field effect transistor 45, the driving control module 30 drives the gate of the first field effect transistor 42 and the gate of the second field effect transistor 43 to be at a high level to turn on the first field effect transistor 42 and the second field effect transistor 43, the driving control module 30 stops transmitting the driving current to the base of the third field effect transistor 41 to enable the base of the third field effect transistor 41 to be in a high-impedance state, at this time, because the triode 41 has a base charge storage effect, the current flowing through the inductor 03 and the triode 41 is switched to charge the power supply voltage VDD node through the first field effect transistor 42, and the source output current of the first field effect transistor 42 continuously and linearly rises, the second fet 43 and the first fet 42 are in a fixed ratio, so that the current flowing through the second fet 43 and the current flowing through the first fet 42 are in a fixed ratio, the current flowing through the second fet 43 is provided to the peak current detection module 50, when the peak current detection module detects that the current flowing through the second fet 43 reaches a second preset current value, the driving control module 30 inputs a low level to the base of the triode 41, turns off the triode 41, and the driving control module 30 drives the gate of the first fet 42 and the gate of the second fet 43 to input a low level to turn off the first fet 42 and the third fet 43, thereby ending the charging of the supply voltage VDD node and avoiding the charging supply VDD node from being over-voltage.
The switching power supply circuit may drive an inductor, inject energy into the inductor 03, and maintain each switching cycle of the transistor 41 to make the inductor 03 reach a fixed peak current, and after the transistor 41 is turned off, the energy stored in the inductor 03 may be output to an output terminal of the power supply through various power supply loops, for example, to supply energy to a secondary winding through a coupling inductor.
After several cycles of charging, the output voltage of the power voltage VDD node after being divided by the voltage dividing circuit module 70 is input to the first input terminal of the first comparator 10 and is greater than the reference voltage of the second input terminal of the first comparator 10, at this time, the output terminal of the first comparator 10 outputs a high level and the control logic module 20 enters the non-self-powered driving mode, the control logic module 20 outputs the driving control signals S1 to S6 at the first output terminal kc1 of the control logic module 20 according to the logic of the non-self-powered driving mode, and outputs the switching control signals at the second output terminal kc2 of the control logic module 20 and the third output terminal kc3 of the control logic module 20 to control the peak current value detecting module 50.
Referring to the waveform diagram of fig. 6, where Ipk2 is a second preset current value, Ip _ sen is a current signal output by the source of the second fet 43, In _ sen is a current signal output by the drain of the fourth fet 45, B is an output signal of the first output qc1 of the driving control module 30, E is an output signal of the emitter of the transistor 41, N1_ gate is an output signal of the third output qc3 of the driving control module 30, and P1_ gate is an output signal of the second output qc2 of the driving control module 30, the unpowered driving mode control logic is explained as follows:
the third output end qc3 of the driving control module 30 and the second output end of the driving control module 30 are controlled to output high level, the first output end qc1 of the driving control module 30 is controlled to output driving current to the B port of the triode, at this time, the triode 41 and the third field effect transistor 44 are synchronously turned on, the third output end qc3 of the driving control module 30 is controlled, and the current flowing through the inductor 03, the triode 41 and the third field effect transistor 44 linearly rises. The fourth fet 45 and the third fet 44 are in a fixed ratio, so that the current flowing through the third fet 44 and the current flowing through the fourth fet 45 rise in a fixed ratio, and the current flowing through the fourth fet 45 is supplied to the peak current detection module 50. When the peak current detection module 50 detects that the output current of the drain of the fourth field effect transistor 45 reaches the second current preset value, the driving control module 30 drives the gate of the third field effect transistor 44 and the gate of the fourth field effect transistor 45 to be at a low level to turn off the third field effect transistor 44 and the fourth field effect transistor 45, the driving control module 30 drives the base of the triode 41 to be at a low level to turn off the triode 41, the driving control module 30 drives the gate of the first field effect transistor 42 and the gate of the second field effect transistor 43 to be at a low level to turn off the first field effect transistor 42 and the second field effect transistor 43, and the charging of the power supply voltage node is finished.
In the non-power-supply driving mode, the turn-off threshold values of the third field-effect transistor 44 and the fourth field-effect transistor 45 are adjusted from the first preset current value to the second preset current value, and meanwhile, the first field-effect transistor 42 and the second field-effect transistor 43 are not turned on any more, so that the charging of the power supply voltage node is finished, and the overvoltage of the power supply voltage node is avoided.
In one embodiment, the first fet 42 and the second fet 43 are P-fets and the third fet 44 and the fourth fet 45 are N-fets.
In one embodiment, transistor 41 and first fet 42 form a first drive current path, transistor 41 and third fet 44 form a second drive current path, first fet 42 and second fet 43 form a first current mirror, and third fet 44 and fourth fet 45 form a second current mirror.
In one embodiment, as shown in fig. 4, the peak current detecting module 50 includes a first signal input terminal fr6, a second signal input terminal fr7, a third signal input terminal fr8, a fourth signal input terminal fr9, a first switch 52, a second switch 53, a third resistor 51 and a second comparator 54, wherein the third signal input terminal fr8 is used as the second input terminal fr2 of the peak current detecting module 50, and the fourth signal input terminal fr9 is used as the first input terminal fr1 of the peak current detecting module 50;
a first terminal of the first switch 52 is connected to the first signal input terminal fr6 or the second signal input terminal fr7, and a first terminal of the second switch 53 is connected to the third signal input terminal fr8 or the fourth signal input terminal fr 9;
the second terminal fr10 of the first switch 52 is used as the fourth input terminal fr4 of the peak current detection module 50, and the second terminal fr11 of the second switch 53 is used as the fifth input terminal fr5 of the peak current electrical detection module 50;
the second terminal fr10 of the first switch 52 is connected to the positive input terminal of the second comparator 54, the second terminal fr11 of the second switch 53 is connected to the negative input terminal of the second comparator 54, one end of the third resistor 51 is connected to the connection line between the second terminal fr11 of the second switch and the negative input terminal of the second comparator 54, and the other end of the third resistor 51 is grounded;
the output of the second comparator 54 is the output fc of the peak current detection module 50.
Specifically, the peak current detecting module 50 receives the switch control signal output by the third output terminal kc3 of the control logic module 20 and the switch control signal of the second output terminal kc2 of the control logic module 20, controls the first switch 52 and the second switch 53 to be turned on and off, and compares the input signal of the positive input terminal and the input signal of the negative input terminal according to the second comparator 54 to output a signal to the second input terminal kr2 of the control logic module 20.
In the self-powered driving mode, the second switch 53 receives the current signal output from the third output terminal dc3 of the current path module 40, the first switch 52 receives the voltage signal from the first signal input terminal fr6, the current signal output from the third output terminal dc3 of the current path module 40 is converted into a voltage signal by the third resistor 51, the voltage signal is input to the negative input terminal of the second comparator 54, as the current signal output from the third output terminal dc3 of the current path module 40 increases, the voltage at the negative input terminal of the second comparator 54 rises synchronously, when the voltage exceeds the voltage signal input from the positive input terminal of the second comparator 54 to the first signal input terminal fr6, the output terminal of the second comparator 54 rises to a high level, and the high level is sent to the second input terminal kr2 of the control logic module 20 to trigger the control logic to perform corresponding actions, for example, the third fet 44 and the fourth fet 45 of the current path module 40 are turned off, the first fet 42 and the second fet 43 are turned on to make the current signal output from the third output dc3 of the current path module 40 drop to 0V, and then the output port of the second comparator 54 also drops to 0V, and at the same time, the second switch 53 is connected to the source of the second fet 43, the first switch 52 receives the voltage signal of the second input signal terminal fr7, as the output current flowing through the source of the second fet 43 rises, the voltage at the negative input terminal of the second comparator 54 will exceed the voltage signal of the second input signal terminal fr7, the output signal at the output terminal of the second comparator 54 rises to high level, and the high level is sent to the second input kr2 of the control logic module 20 to trigger the control logic to perform corresponding actions, for example, the first fet 42 and the second fet 43 of the current path module 40 are turned off, the triode 41 is turned off, the output current flowing through the source of the second fet 43 is reduced to 0V, and the output signal of the output terminal of the second comparator 54 is reduced to 0V.
In the non-self-powered driving mode, the second switch 54 receives the current signal output from the third output terminal dc3 of the current path module 40, the first switch 53 receives the voltage signal input from the second signal input terminal fr7, the current signal output from the third output terminal dc3 of the current path module 40 is converted into a voltage signal by the third resistor 51, the voltage signal is input to the negative input terminal of the second comparator 54, the voltage at the negative input terminal of the second comparator 54 rises synchronously with the increase of the current signal output from the third output terminal dc3 of the current path module 40, when the voltage exceeds the voltage signal input from the second signal input terminal fr7 of the positive input terminal of the second comparator 54, the output signal at the output terminal of the second comparator 54 rises to a high level, and the high level is sent to the second input terminal kr2 of the control logic module 20, so as to trigger the control logic to perform corresponding actions, for example, the first fet 42 and the second fet 43 of the current path module 40 are turned off, and the transistor 41 is turned off, so that the current signal output from the third output terminal dc3 of the current path module 40 is decreased to 0V, and the output signal of the output terminal of the second comparator 54 is also decreased to 0V.
In this embodiment, the circuit structure can accurately detect the current connected to the ground through the third field effect transistor and the fourth field effect transistor, and accurately detect the current connected to the power supply voltage VDD node through the first field effect transistor and the second field effect transistor, and can switch the switching timing sequence of the first field effect transistor, the second field effect transistor, the third field effect transistor and the fourth field effect transistor according to the voltage of the power supply voltage VDD node, so that the circuit structure can accurately detect and control the peak current passing through the inductor, and can also control the charging current provided to the power supply voltage VDD node, so that the power supply voltage VDD cannot be undervoltage or overvoltage, and the load circuit is prevented from being damaged.
In one embodiment, the first switch 52 and the second switch 53 are single pole double throw switches.
In one embodiment, the first output qc1 of the driving control module 30 is a tri-state signal, and the second output qc2 of the driving control module 30 and the third output qc3 of the driving control module 30 are two-state signals, wherein the tri-state signal is a constant current signal, a high impedance signal or a low level signal, and the two-state signal is a high level signal or a low level signal.
Illustratively, as shown in fig. 7, the driving control module 30 includes a first group of switches 31, a second group of switches 32, and a third group of switches 33, wherein the first group of switches 31 includes a first sub-switch 310 and a second sub-switch 311, one end of the first sub-switch 310 is connected to one end of the second sub-switch 311, the other end of the first sub-switch 310 is connected to the power voltage, the other end of the second sub-switch 311 is connected to the ground, the second group of switches 32 includes a third sub-switch 320 and a fourth sub-switch 321, one end of the third sub-switch 320 is connected to one end of the fourth sub-switch 321, the other end of the third sub-switch 320 is connected to the power voltage, the other end of the fourth sub-switch 321 is connected to the ground, the third group of switches 33 includes a fifth sub-switch 330 and a sixth sub-switch 331, one end of the fifth sub-switch 330 is connected to one end of the sixth sub-switch 331, the other end of the fifth sub-switch 330 is connected to the power voltage, the other end of the sixth sub-switch 331 is connected to the ground, the connection point of the first sub-switch 310 and the second sub-switch 311 serves as the first output qc1 of the driving control module 30, the connection point of the third sub-switch 320 and the fourth sub-switch 321 serves as the second output qc2 of the driving control module 30, and the connection point of the fifth sub-switch 330 and the sixth sub-switch 331 serves as the third output qc3 of the driving control module 30.
The second output qc2 of the driving control module 30 is a binary signal, which may be a high level or a low level, and is used to drive the first fet 42 and the second fet 43 in the circuit path module 40, and the third output qc3 of the driving control module 30 is a binary signal, which may be a high level or a low level, and is used to drive the third fet 44 and the fifth fet 45 in the circuit path module 40. The first output qc1 of the driving control module 30 is a tri-state signal, which can be a constant current output, a high impedance (floating) or a low level, and is used to drive the base of the transistor 41.
In this embodiment, the driving control module outputs a tri-state signal and a bi-state signal according to the output signal of the control logic module, and is used for driving the on/off of the triode, the first field effect transistor, the second field effect transistor, the third field effect transistor and the fourth field effect transistor of the current path module, so as to control the output current of the current path module, switch the charging state (stop or start) of the power supply voltage VDD node, and be beneficial to avoiding the undervoltage or overvoltage of the power supply voltage VDD.
In an embodiment, as shown in fig. 3, the voltage dividing circuit module 70 includes a first resistor 71 and a second resistor 72, a first end of the first resistor 71 is used as an input end of the voltage dividing circuit module 70, a second end of the first resistor 71 is used as an output end of the voltage dividing circuit module 70, a first end of the second resistor 72 is connected to the second end of the first resistor 71, and a second end of the second resistor 72 is connected to ground.
Specifically, the first resistor 71 and the second resistor 72 constitute a feedback voltage dividing resistor of the power supply voltage VDD node, and the voltage of the output terminal of the voltage dividing circuit module 70 is in a fixed ratio to the voltage of the power supply voltage VDD node.
Specifically, the voltage division circuit module divides the power voltage VDD to output a voltage division signal, the output of the first comparator can be controlled according to the voltage of the power voltage VDD, and the overvoltage or undervoltage of the power voltage VDD can be avoided.
In one embodiment, when the output of the first comparator 10 inputs a low level to the first input kr1 of the control logic block 20, the control logic block 20 enters the self-powered driving mode,
when the output of the first comparator 10 inputs a high level to the first input kr1 of the control logic block 20, the control logic block 20 enters the non-self-powered driving mode.
In this embodiment, the control logic module is controlled by the output signal of the first comparator, so as to avoid the over-voltage or under-voltage of the power voltage VDD.
In one embodiment, as shown in fig. 1, the switching power supply module further includes a starting resistor 60, a first terminal of the starting resistor 60 is connected to the first input terminal dr1 of the current path module 40, and a second terminal of the starting resistor 60 is connected to the second input terminal dr2 of the current path module 40.
Specifically, when the voltage of the power voltage VDD node is lower than the reference voltage of the second input terminal of the first comparator 10, the base of the transistor 41 may be supplied with current through the starting resistor 60, and then the current is amplified through the transistor 41, and then the charging current is supplied to the power voltage VDD node through the starting resistor 60, so as to avoid the power voltage VDD being under-voltage.
It is to be understood that the above-described embodiments are merely illustrative of some, but not restrictive, of the broad invention, and that the appended drawings illustrate preferred embodiments of the invention and do not limit the scope of the invention. This application is capable of embodiments in many different forms and is provided for the purpose of enabling a thorough understanding of the disclosure of the application. Although the present application has been described in detail with reference to the foregoing embodiments, it will be apparent to one skilled in the art that the present application may be practiced without modification or with equivalents of some of the features described in the foregoing embodiments. All equivalent structures made by using the contents of the specification and the drawings of the present application are directly or indirectly applied to other related technical fields and are within the protection scope of the present application.
Claims (10)
1. A switching power supply circuit comprising: the signal source is connected with a first end of the inductor, a second end of the inductor is connected with a first input end of the switching power supply module, a first end of the capacitor is connected with a second input end of the switching power supply module, and a second end of the capacitor is grounded, the switching power supply module is characterized by comprising a current path module, a voltage division circuit module, a first comparator, a control logic module, a driving control module and a peak current detection module, wherein,
the output end of the voltage division circuit module is connected with the first input end of the first comparator, the input end of the voltage division circuit module is connected with the first end of the capacitor, the output end of the first comparator is connected with the first input end of the control logic module,
the first output end of the control logic module is connected with the second input end of the drive control module, the second output end of the control logic module is connected with the fourth input end of the peak current detection module, the third output end of the control logic module is connected with the fifth input end of the peak current detection module, the output end of the peak current detection module is connected with the second input end of the control logic module,
the first output end of the driving control module is connected with the first input end of the current path module, the second end of the inductor is connected with the second input end of the current path module, the second output end of the driving control module is connected with the third input end of the current path module, the third output end of the driving control module is connected with the fourth input end of the current path module, wherein the second input end of the current path module is used as the first input end of the switching power supply module,
the first output end of the current path module is connected with the third input end of the peak current detection module, the second output end of the current path module is connected with the first input end of the peak current module, the third output end of the current path module is connected with the second input end of the peak current module,
the third input end of the peak current detection module is connected with the first end of the capacitor, wherein a connection point of the third input end of the peak current detection module and the input end of the voltage division circuit module is used as the second input end of the switching power supply module, and the output end of the peak current detection module is connected with the second input end of the control logic module.
2. The switching power supply circuit according to claim 1, wherein the current path block comprises a triode, a first field effect transistor, a second field effect transistor, a third field effect transistor, and a fourth field effect transistor, wherein,
the base electrode of the triode is the first input end of the current path module, the collector electrode of the triode is the second input end of the current path module, the emitter electrode of the triode is connected with the drain electrode of the first field effect transistor, the drain electrode of the second field effect transistor and the drain electrode of the third field effect transistor,
the grid electrode of the first field effect transistor is used as the third input end of the current path module, the grid electrode of the second field effect transistor is connected with the grid electrode of the first field effect transistor, the source electrode of the first field effect transistor is used as the first output end of the current path module, the source electrode of the second field effect transistor is used as the second output end of the current path module,
the grid electrode of the third field effect transistor is used as the fourth input end of the current path module, the drain electrode of the fourth field effect transistor is used as the third output end of the current path module,
the grid electrode of the first field effect tube is connected with the grid electrode of the second field effect tube, the grid electrode of the third field effect tube is connected with the grid electrode of the fourth field effect tube, and the source electrode of the third field effect tube and the source electrode of the fourth field effect tube are grounded.
3. The switching power supply circuit according to claim 2, wherein said first fet and said second fet are P-type fets, and said third fet and said fourth fet are N-type fets.
4. The switching power supply circuit according to claim 2, wherein said transistor and said first fet constitute a first drive current path, said transistor and said third fet constitute a second drive current path, said first fet and said second fet constitute a first current mirror circuit, and said third fet and said fourth fet constitute a second current mirror circuit.
5. The switching power supply circuit according to claim 1, wherein the peak current detection module comprises a first signal input terminal, a second signal input terminal, a third signal input terminal, a fourth signal input terminal, a first switch, a second switch, a third resistor, and a second comparator, wherein the third signal input terminal is the second input terminal of the peak current detection module, and the fourth signal input terminal is the first input terminal of the peak current detection module;
a first end of the first switch is connected to the first signal input terminal or the second signal input terminal, a first end of the second switch is connected to the third signal input terminal or the fourth signal input terminal,
the second end of the first switch is used as the fourth input end of the peak current detection module, and the second end of the second switch is used as the fifth input end of the peak current electrical measurement module;
a second end of the first switch is connected to a positive input end of the second comparator, a second end of the second switch is connected to a negative input end of the second comparator, one end of the third resistor is connected to a connection line between the second end of the second switch and the negative input end of the second comparator, and the other end of the third resistor is grounded;
the output end of the second comparator is the output end of the peak current detection module.
6. The switching power supply circuit according to claim 5, wherein said first switch and said second switch are single pole double throw switches.
7. The switching power supply circuit according to claim 1, wherein the first output terminal of the driving control module is a tri-state signal, the second output terminal of the driving control module and the third output terminal of the driving control module are dual-state signals, wherein the tri-state signal is a constant current signal, a high impedance signal or a low level signal, and the dual-state signal is a high level signal or a low level signal.
8. The switching power supply circuit according to claim 1, wherein the voltage divider circuit module includes a first resistor and a second resistor, a first end of the first resistor serves as an input end of the voltage divider circuit module, a second end of the first resistor serves as an output end of the voltage divider circuit module, a first end of the second resistor is connected to a second end of the first resistor, and a second end of the second resistor is grounded.
9. The switching power supply circuit according to claim 1, wherein said control logic block enters a self-powered driving mode when said output terminal of said first comparator inputs a low level to said first input terminal of said control logic block,
when the output end of the first comparator inputs a high level to the first input end of the control logic module, the control logic module enters a non-self-power-supply driving mode.
10. The switching power supply circuit according to claim 1, wherein the switching power supply module further comprises: and the first end of the starting resistor is connected with the first input end of the current path module, and the second end of the starting resistor is connected with the second input end of the current path module.
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